As shown in Figure below, a flexible belt placed around a rotating drum of 120-mm radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.20 determine the force P that would result in a braking torque of 12,000-N.mm, assuming that the drum is rotating counterclockwise. Neglect the weight of the brake arm. 60° 60 | B 60 - 120 – 60 mm mm 120 mm

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.